Electric tool-driver.



PATENTED APR. 18, 1905.

F. WAGNER,

ELECTRIC TOOL DRIVER.

APPLICATION FILED 17130.7,1904.

UNITED STATES Patented April 18, 1905.

PATENT OFFICE.

WILLIAM F. WAGNER, OF NEIY YORK, N. Y., ASSIGNOR TO AMERICAN INVENTIONS COMPANY, OF NEW YORK, N. Y., A CORPORA ION OF NEW JERSEY.

ELECTRIC TOOL-DRIVER.

SPECIFICATION forming part of Letters Patent No. 787,707, dated April 18, 1905.

Application filed December '7, 190A. Serial No. 235,818.

To all whom it may concern:

Be it known that I, WILLIAM F. IVAGNER, a citizen of the United States, and a resident of the borough of Manhattan, in the city and State of New York, have invented a new and useful Electric Tool-Driver, of which the following is a specification.

My invention relates to electric tool-drivers, and more particularly to that type of tooldriver in which the coreof a solenoid under the influence of the energized magnets serves by its reciprocating movement to drive the tool.

The particular form of tool-driver which I have chosen to illustrate my invention is that suited to driving a drillas, for instance, a rock-drill.

In the accompanying drawings, Figure 1 is a view of the drill in longitudinal section. Fig. 2 is a transverse section, on an enlarged scale, in the plane of the line A A of Fig. 1. Fig. 3 is partial face view, and Fig. 1 is a diagrammatical view, showing the manner of making the electrie'connections between the recipro eating commutator and the several coils.

An important feature of this invention is the introduction of a demagnetizing-coil at both ends of the implement for promptly releasing the core of the solenoid or driver proper from its work at each end of its stroke.

Another important feature of this invention is the reciprocatingcommutator working automatically in connection with the coils of the drill and making its contacts in magnetic fields which destroy the spark.

My invention further consists in certain features of construction and combinations of parts, as will be hereinafter described, and pointed out in the claims.

The casing consists of a central tube 1, preferably of brass, within which the core or driver proper,2,reciprocates and about which the sev eral coils (in the present instance four) are arranged and denoted by 3, 4, 5, and 6. An

outer tube 7, preferably of steel, covers the said coils, the said inner and outer tubes being connected at their opposite ends by a footpiece 8 and a head-piece 9, the inner tube 1 being arranged to slip over a neck 10 on the foot-piece and within the bore 11 of the headpiece 9. A movable block 12 is inserted between the head-piece and the coil 6 for forcing the several coils tightly together and holding them firmly between the head and foot pieces. At the foot the shank 13 of the tool-holder 14 extends centrally through the foot-piece 8, with its inner end in position to receive the blows from the driver 2. The said shank also extends through a chuck 15, mounted in a frame-piece 16, securely fastened to the exterior of the tube 7 of the easing, the said chuck being keyed to the shank 13, so as to permit the latter to slide longitudinally through the chuck while causing the said shank 13 to rotate with the chuck.

Around the shank 13 there is a ring 17, in which are seated spring actuated driving pawls 18 (in the present instance four) at a quadrants distance apart, the said pawls being arranged to engage a series of ratchetteeth 19 on the exterior of the chuck, as clearly shown in Fig. 2.

The shank 13 of the tool-holder also passes through a bearing-sleeve 20, fitted to the end of the frame-piece 16, the said bearing-piece 20 forming together with the interior bore at the end of the frame piece 16 an annular chamber 21, to which a cooling liquid water, for example may be fed by a pipe 22, connected with an opening 23 in the frame-piece 16, leading to the said annular chamber 21.

The shank 13 is made hollow throughout the portion indicated by dotted lines 24, and this hollow interior of the shank communicates through openings 25 with the annular chamber 21. The said hollow interior of the shank 13 communicates in the present instance with the hollow interior 26 of the tool 27 to furnish water or cooling liquid to the cutting edge of the tool.

The longitudinal movement of the toolholder, and hence of the tool,-is limited in one direction by the bearing-piece 20 and in the opposite direction by a stop 28,secured to the frame-piece 16 and partially embracing the reduced neck 29 of the tool-holder.

The ring 17 is rotated by the action of the driver 2, as follows: A slide 30, provided with an oblique slot 31,(see Fig. 3),receives a pin 32 in the slot 31, the said pin 32 being lixed to the ring 17. The slide is provided with an operating rod 33, which extends toward the head of the drill, where it is connected to an arm 34, projecting through the elongated slot 35 in the head-piece 9 and fixed to a reciprocating plunger 36, located within the tube 1 in position to receive the upstroke of the driver 2. The rod 33 has a sliding connection with the arm 34, the extent of its sliding movement being limited by nuts 37 38 on the rod, and a spring 39, interposed between the nut 38 and the arm 34, serves to cushion the arm under the upstroke of the driver. The plunger 36 also serves to pump water or cooling liquid to the drill, as follows: A pumping piston-rod 40 is attached to the outer end of the plunger 36 by means of the piece 41 and works in a cylinder 42, which is in communication with valve chambers provided with valves 43 44, the former controlling the flow of liquid to the discharge-pipe 45 and the latter controlling the entrance of the liquid through the pipe 46.

The discharge-pipe, referred to as 45, is intended to be connected by a suitable pipe (shown broken away)with the pipe 22,through which the cooling liquid is admitted to the annular chamber 21.

The casing carrying the working parts, as hereinabove described, is mounted in a suitable support 47 and is fed bodily toward its work, as is common, by means of a worm 48, operated by a crank 49 and engaging a rack 50 on the exterior of the tube 7.

The coils 3 and 6, which 1 term demagnetizing-coils are energized, the former simultaneously with the energizing of the coil 5 and the latter simultaneously with the energizing of the coil 4, to destroy the attraction of the tool-holder shank 13 for and to cause it to repel the driver 2 or core of the solenoid from its work at that end and in like manner to cause the plunger 36 to repel the driver 2 from its contact at that end. It does not, however, matter if both these coils 3 and 6 be energized simultaneously with the energizing of the one or the other of the coils 4 and 5, as they are light coils and relied upon not for the purpose of drawing the driver 2 in either direction, but for repelling it from its contact with the tool-shank and plunger the moment it has done its work.

The energizing and deenergizing of the several coils to cause the driver 2 to reciprocate within the tube 1 is accomplished by a reciprocatingcommutator which operates to energize and deenergize the coils 3 to 6, inclusive, and which starts automatically on the closing of the switch under the control of the operator manipulating the tool. This reciprocating commutator may be described as follows: Two coils 51 and 52 are employed as blow-out the breaking of contact. These coils have contact-pieces 53 54 in their outer ends, and a core consisting of a rod 55 of material such as is suitable for the core of a solenoid is mounted in the central tubes of two drivingcoils 56 57. The said core 55 has its enlarged central portion 58 connected by an arm 59 with a plunger 60, working in cylinders 61 62, the said cylinders forming dash-pots for preventing the forcible impact of the core 55 against the contact-pieces 53 54.

The driving-coil 56 has within it a coil 63 of lesser size and power than the coil 56 proper and which, together with the coils 51 and 52, is maintained energized at all times to hold the core 55 in contact with the contact-piece 53 when the tool is at rest and the main switch 64 open.

The main switch, referred to as 64, is indicated in Fig. 4 diagrammatically, and its counterpart in the practical tool denoted in Fig. 1 is represented as a rheostat 65 of any wellknown or approved form, and it is to be understood that the wires leading from the source of electrical energy or generator (indicated conventionally at 66, Fig. 4) and from the reciprocating commutator pass through a tube (indicated at 67, Fig. 1) to the rheostat and thence along the channel 68 in the headpiece 9, through an opening 69 in the block 12, and thence along beneath the outer tube 7 to the proper contacts with the coils at the points indicated in the diagram Fig. 4. The connections are made as follows: from one pole of the source of electrical energy 66 by a wire 70 to the coil 51, from the coil 51 by a wire 71 with the coil 63, from the coil 63 by a wire 72 to the coil 52, and from the coil 52 by a wire 73 to the opposite pole of the generator 66. A branch wire 74 also connects the wire 70 with the core 55 otthe commutator. The contact-piece 53 at the center of the coil 51 is connected by a wire 75 with one pole ol the coil 57. A wire 76 leads from the other pole of the coil 57 to one pole of the demagnetizing-coil 6 of the drill, the other pole of said coil 6 being connected by a wire 77 with a pole of the coil 4, the opposite pole of said coil being connected by a branch wire 78 and main wire 79 with one terminal of the switch 64 and when the switch is closed through the switch and wire 80 to a pole of the generator. It now the core 55 be in electrical contact with the contact 53 in the coil 51, the position which it normally occupies when the tool is not in operation and the switch 64 open the closing of the switch 64 will simultaneously energize the coil 6 and the coil 4, and the driver 2 will be thereby repelled from the plunger 36 and will be drawn by the coil 4 toward the tool-shank 13 and deliver its blow on the shank. The circuit for accomplishing this is complete through the wire 70, leading from one pole of the generator and coils for putting out or preventing a spark at l branch wire 74 to the core 55, and thence ICC ' 15 one or more steps.

through the contact 53 and wire 7 5, &c., back to the opposite pole of the generator through the wire 80. The completion of this circuit for moving the driver toward the shank of the tool-holder included the energizing of the coil 57 of the commutator, which in turn had the effect of drawing the core 55 of the commutator away from the contact 53 and its opposite end into engagement with the contact 54;. This promptl; broke the circuit through the coil i of the drill and established the circuit through coil 5 of the drill and also through the demagnetizing-coil 3 of the drill, as follows: A wire 81 leads from the contact 54 at the center of the coil 52 to one pole of the coil 56, the opposite pole of said coil being connected by a wire 82 with one pole of the coil 5, the opposite pole of said coil 5 being connected by the wire 83 with one pole of the coil 3, the opposite pole of said coil 3 being connected by a wire 8 with the wire 79, leading to the switch 64, and through the wire 80 to one pole of the generator, the opposite pole of the generator being connected by wire and branch wire 74 and core 55 with the contact 54, and hence completing the circuit. This will simultaneously energize coils 3 and 5, and the driver 2 will be drawn back and impinge against the plunger 36, doing its Work at that end by operating the pumpingpiston 40 and also the rod 33, which in turn will move the slide 30 with its diagonal slot backwardly away from the foot of the implement and so, because of the pin 32 in the oblique slot 31, rotate the pawl-carrying ring 17 in a direction to positively rotate the chuck This completing of the circuit through the coil 56 of the commutator will, however, in turn draw the core 55 in the opposite direction, thereby breaking circuit through coil 5 of the drill and by the contact of the core 55 with the contact 53 will again complete the circuit through coils 4E and 6, thereby causing the driver 2 to move in the opposite direction toward the shank of the tool-holder. The return movement of the plunger 36 is provided for by the energizing of the coil 6 simultaneously with the energizing of the coil I, which will draw the plunger toward the foot of the drill at the same time that it demagnetizes it and repels the driver therefrom.

hat I claim is- 1. In combination, an electrically-operated reciprocating driver and a reciprocating commutator, comprising a solenoid and contacts arranged to cooperate with the core of the solenoid.

2. In combination, a reciprocating driver comprising a solenoid and a reciprocating commutator comprising a solenoid, the coils of the solenoid-driver beingin circuit with the coils of the solenoid-commutator.

3. A reciprocating driver and electromagnetic coils for operating it in combination with a reciprocating commutator having electric contact-points at its opposite ends housed in the hollow cores of electromagnets.

4:. In combination, a reciprocating driver, electromagnetic coils for reciprocating the driver and demagnetiZing-coils for releasing the driver at the opposite ends of its stroke.

5. In combination, a reciprocating driver, electromagnetic coils for operating the driver, means for applying the force of the driver in one direction to a tool to move the tool longitudinally, and means independent of the driver for applying the force of the driver in the opposite direction to rotate the tool.

6. In combination, an electrically-driven reciprocating driver, means for applying the force of the driver in one direction to drive a tool longitudinally and means for applying the force of the driver in the opposite direction to force a fluid to the tool.

7. In combination, an electrically-driven reciprocating driver, means for applying the force of the driver in one direction to drive a tool longitudinally and means for applying the force of the driver in the opposite direc tion to rotate the tool and force a fluid to the tool.

8. In combination, an electrically-driven reciprocating driver, means for placing a tool under the impact of the driver when the latter moves in one direction, a reciprocating plunger independent of the driver and under the impact of the driver moving in the opposite direction, a ratchet-and-pawl mechanism for rotating the tool and a cam connected with the plunger for actuating the ratchet-and-pawl mechanism.

9. In combination, a reciprocating driver, electromagnetic coils for operating the driver, means for placing a tool under the impact of the driver moving in one direction, a reciprocating plunger under the impact of the driver moving in the opposite direction, means under the control of the plunger for rotating the tool and a demagnetizing-coil for returning the plunger and releasing the driver.

10. In combination, a reciprocating driver, electromagnetic coils for operating the driver in opposite directions, means for placing a tool under the impact of the driver in one direction, a reciprocating plunger under the impact of the driver in the opposite direction,

demagnetizing-coils for releasing the driver at each end of its stroke and means for simultaneously energizing and deenergizing a driver-actuating coil and a demagnetizingcoil at each stroke of the driver.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 19th day of November, 190

I/VILLIAM F. WAGNER.

WVit-nesses:

FREDK. HAYNEs, HENRY THIEME. 

